Endothermic vs. Exothermic

• Endothermic: enthalpy is a reactant

• Exothermic: enthalpy is a product

• 2H2(g) + O2(g) --> 2H2O(g) + 571.6 kJ

• 40.7 kJ + H2O(l) --> H2O(g)

• Consider energy in terms of moles

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